| 摘要 |
A wrench includes a handle, a head extended from the handle, and a drive member rotatably mounted in a compartment of the head. A cavity is defined in a web between the handle and the head and communicated with the compartment. A transverse hole is defined in the web and includes an inner end communicated with the cavity and an outer end communicated with outside. A pawl is slidably mounted in the cavity and includes a toothed side, an attachment side, and a pressing side. An elastic element includes a first end attached to the attachment side of the pawl and a second end attached to an anchor securely mounted in the transverse hole. The toothed side of the pawl is biased to engage with the drive member and the pressing side of the pawl is biased to press against a wall defining the cavity.
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